<br />the 18,915 square miles of the Arkansas River basin above the dam. It
<br />provides 350,951 acre.feet of storage space for conservation and
<br />recreation. John Martin Reservoir supplies water to the irrigated lands
<br />below tbe dam as far as Garden City. Kansas. The top of the con.
<br />servation pool is ~.851 feet above mean sea level, which provides
<br />350,951 acre.feet of storage for irrigation. The release of stored nood
<br />waters in excess of the conservation and recreation plots and above
<br />elevation 3,851 feet is planned so that, when combined with nows
<br />originating downstream from the dam, the capacity of the channel will
<br />not be exceeded. Upon request of the Arkansas River Compact
<br />Administration, irrigation water for downstream water users is
<br />released through the outlet works in the base of the dam. Do,,'nstream
<br />nood damages prevented by John Martin dam already exceed the cost
<br />or'the project. Benefits have already passed the $92 million mark,
<br />Recreation and favorable fish and wildlife habitats are derived from
<br />this project. With reservoir lands open to all, there are many attractive
<br />public use areas for outdoor recreation, water sports. fishing and
<br />boating, or just relaxed living. During construction some embankment
<br />material was obtained Cram a 75-acre tract of land immediately
<br />downstream of the dam. This excavated area, averaging 12 feet deep.
<br />filled with water and formed Lake Hasty, the center of year-round
<br />recreation.
<br />John Martin Dam consists of a concrete gravity structure 1,644 feet
<br />long and 120 feet high, and an earthfill structure 2,600 feet long. The
<br />concrete gravity structure contains a gated spillway provided with
<br />sixteen 30 feet by 64 feet tainter !liltes with their operating machinery.
<br />There are earthen Wing dams on either side of the main dam. The
<br />north wing dam is 3,880 feet long, connecting to the earthfill structure
<br />of the main dam at the north abutment, The south wing dam is 5.807
<br />feet long and connects to the south end of the concrete structure of the
<br />main dam. A bituminous-surfaced roadway, 21 feet wide, extends along
<br />the crest of the north wing dam, main dam, and south wing dam. The
<br />overall length of the structure is 2,6 miles. Detailed pro.iec~ data are
<br />shown below.
<br />DAM
<br />Total length, feet,
<br />Maximum height above streambed, feet ' ,
<br />Width of roadway on dam, feet,
<br />
<br />13.945
<br />118
<br />21
<br />
<br />SPILLWAY
<br />Total length, including piers, feet ""
<br />Crest gates, 30' x 64' ,
<br />Discharge capacity, cubic feet per second.
<br />
<br />1.174
<br />16
<br />. ..639,200
<br />
<br />OUTLET WORKS
<br />Sluicing conduits, 6' x 7';" "
<br />Regulating conduits, 4' x 4'
<br />
<br />4
<br />2
<br />
<br />RESERVOIR
<br />Capacity, acre.feet, , . , ,621,326
<br />Flood control storage, acre-feet. ,. ., ,270.375
<br />Conservation (irrigation) and recreation, storage, acre-feet. . . . .350.951
<br />Water swiace at spillway crest, acres. 8.960
<br />
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